Oil cooling system



Sept. 15, 1936. H. M. YEAGER OIL COOLING SYSTEM 2 Sheets-Sheet l \1 JMJM m G n n A m Filed Jan. 27, 19151 Sept. 15, 1936. YEAGER 2,054,403

OIL COOLING SYSTEM Filed Jan. 27, 1951 2 Sheets-Sheet 2 *ilihiiipiminimgwuentoz Henry myeager,

Patented Sept. 15, 1936 2,054,403 l on. COOLING SYSTEM Henry M. Yeager,Buffalo, N. Y., assignor to Fedders Manufacturing Uompany, Inc.,Buffalo, N. Y.

" Application January 27, 1931, Serial No. 511,638

2Claims.

This invention relates to an oil cooling system for internal combustionengines and particularly to such engines which are water-cooled, asthose ordinarily usedfor powering motor vehicles.

Under certain operating conditions the oil in the crank case of such anengine may become excessively heated so that it becomes ineffective as alubricant and may be burned at a rapid rate. Under other operatingconditions, such as when the engine is started in cold weather, the oilmay be cold and congealed and will ordinarily require considerable timeto become heated to a temperature proper for lubricating. Heretofore, ithas been proposed to utilize engine heat which has been transferred tothe water of the engine cooling system to regulate the temperature ofthe crankcase oil.-

This invention comprehends an improved means of heat transfer wherebythe crank case oil, when at a sub-normal temperature may be heated bythe engine cooling water, and may be cooled to a normal temperature bythe water, when it might otherwise become excessively heated. Thetransfer means comprises a small unit, capable of economical manufactureand installation, which may be disposed in a water tank of the enginewater-cooling radiator. Such a tankis conventionally disposed beneaththe cooling elements of the radiator and serves as a collector forreceiving water passing from the entire lower portion of the coolingelements and for conducting the water to a conduit leading to the enginewater jacket. The heat transfer means comprises a unitary element,disposed longitudinally of the tank in order that the water maycirculate about it to emciently exchange heat with the crank case oilwhich may be circulated through the transfer means. V

The invention further resides in the features of construction andinstallation of the unit which render it efllcient in operation andeconomical to manufacture, as will become apparent from a perusal of thefollowing description of typical embodiments of the principles of theinvention, reference being made to the accompanying drawings wherein:

Fig. 1 is a side elevational view of an internal combustion'engine,including the water cooling system, and showing an oil cooling system ofthe invention installed therewith;

Fig. 2 is a rear elevational view of a portion of the water coolingradiator with a heat transfer device installed;

5 Fig. 3 is an enlarged side elevation of the parts shown in Fig. 2,portions thereof being broken away;

Fig. 4 is a perspective view of the heat transfer device of thepreceding views;

Fig. 5 is a fragmentary sectional view of an s end of the device shownin Fig. 4;

Fig. 6 is a fragmentary perspective view of a heat transfer devicehaving an alternative 'construction; and

Fig. 7 is a detail cross sectional view through a portion of the devicedepicted in Fig. 6.

As shown in Fig. l the internal combustion engine III has a jacket H forconducting cooling ,water about the engine cylinders. A conduit l2 mayconduct the heated water to the radiator l3, which may be cooled by airdrawn by a fan It. A water tank I5 is disposed at the bottom of theradiator to collect the water passing to the bottom of the radiator andto conduct it, through a hose attaching nipple l6 which may be disposedat one side of the tank, to the conduit I! leading to the water jacketll. Lubricating oil from the engine crank case l8 may be circulated,being forced under pressure by a pump iii if desired,

through an oil line 2|, through the heat transfer device 22 which isdisposed in the tank l5, and thence through the oil line 23 to theengine oil distributing system. The latter may conduct the oil to theengine bearings, cylinder walls, or other parts to be lubricated.

The heat transfer device 22 comprises a metal- 110 tube 24 which,preferably, has been flattened to afford it a large surface as comparedwith its volumetric content. As shown in Figs. 4 and 5, the ends of thetube may be cut with the upper 35 and lower portions of unequal length,the longer portions 25 being bent over and sealed, by soldering orotherwise, against the shorter portions 26. The dotted lines in Fig. 5indicate the condition of a tube end before the latter operation and the4 full lines show the final relationship. In order to provideoil inletand exhaust passages at the tube ends, the latter may be sealed, in themanner above pointed out, across only a portion of the tube ends, theremaining portions of the ends being formed into tubular sections 21.Elbow fittings 28 may be inserted in the tubular sections and fixedlysecured therein by soldering or otherwise.

The rear face of the tank 15, adjacent the ends, may. be provided withflanged apertures 29, through which the outer ends of the elbows 28 maybe inserted and secured, the flanges. of the apertures providing asuflicient area of contact may be secured to the forward wall of thetank l5 by one or more-brackets 8!, indicated in Figs. 2 and 3. In orderto increase the radiating area of the tube 24, fins may be provided. Inthe illustrated embodiment these comprise a single strip of metal 33,secured to the top surface of the tube, and having a plurality oilongitudinally extending serrations or corrugations 38.

In the modified construction shown in Figs. 6 and 7, the tube 24', whichmay be flattened as the tube 24, has its ends sealed entirely across bybending the longer of the upper and lower tube end portions 25 over theshorter portions 26. Openings 35, shown in Fig. 7, are formed on therear side ,of the tube adjacent the ends thereof and forked'nipples 36are secured to the tube over these openings. The forked portions 31overlie a considerable area of the tube 24' so that a strong joint iseffected. The unit, including the nipples and tube, and cooling finsupon the tube if desired, may be secured to a radiator tank is in thesame manner as the unit 28, 28,

33, the nipples 28 extending through the flanged oil, cooled to atemperature suitable for eflicient lubricating, will be conducted by theline 23 to the engine oil distributing system. Should the engine bestarted in cold weather, so that the crank case all is unduly cooled,the process of heat transfer may be reversed and the water, heated inthe engine jacket, may be utilized to heat the oil. Due to theflattening of the heat transfer tube, the,volume of oil containedtherein at any one instant will be small as compared with the contactingarea of the tube, enabling the with the elbows to insure a permanent.watertight ml The forward edges 01 the tube.

oil to rapidly assumea temperature approaching that of'the water in thetank.

The water, following apath indicated by arrowslin Fig. 2, will movedownwardly throughthe radiator and will impinge upon the upper surfaceof thetube 24, 25' or the fin members 38, and will move thereacross tothe water outlet I 6. Because of. the contour of the heat transfer tubesand the member 33, and their comparative- 1y small displacement, theflow of water through the radiator tank will not be materially impeded,but. due to the necessary close contact of the water to the transferelement, efllcient cooling or heating of the oil may be effected.

It will beunderstood. that the embodiments of the invention hereindescribed are merely illustrative and that other embodiments may bemade.

It is therefore intended that the invention be conlongitudinally of thetube secured to one of the wider faces of the tube.

2. For use with a water tank of a water cooling radiator having waterinlet and outlet passages, a wall of said tank having spaced flangedapertures, an oil temperature regulator comprising a tube of wire,narrow cross section disposed longitudinally of said tank with thelonger cross sectional axis of the tube in alignment with the axes ofsaid flanged apertures, tubular fittings joined to end portions of saidtube and'exteuding through said flanged apertures, the tube wallscontacting the flanges to support one side of the tube, and a bracketsecured to said tube for supporting the opposite side of the tube.

' HENRY M. YEAGER.

